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The Fox Hills Formation is a Cretaceous geologic formation in the northwestern Great Plains of North America. It is present from Alberta on the north to Colorado in the south. Fossil remains of dinosaurs , including tyrannosaurs , as well as large marine reptiles, such as mosasaurs , have been recovered from the formation.
The western two-thirds of the state is underlain by an extensive sandstone aquifer, mainly in the Fox Hills Formation and the lower Hell Creek Formation. Although it is close to the surface in the east, it slopes to up to 2000 feet below the ground surface in south-central North Dakota.
The formation stretches over portions of Montana, North Dakota, South Dakota, and Wyoming. In Montana, the Hell Creek Formation overlies the Fox Hills Formation. Dinosaurs and pterosaurs of Hell Creek Formation. In 1966, the Hell Creek Fossil Area was designated as a National Natural Landmark by the National Park Service. [5]
This article contains a list of fossil-bearing stratigraphic units in the state of North Dakota, U.S ... Deadwood Formation: Ordovician: Fox Hills Formation: ...
The Pierre is overlain by marginal marine deposits of the Fox Hills Formation. Most of the formation was deposited in the Campanian Age of the late Cretaceous . However, the discovery of fossils of Baculites baculus in the uppermost beds of the Pierre Shale in the Raton, New Mexico area show that deposition continued here into the early ...
A Late Cretaceous ammonite found in the Fox Hills Formation. Some of South Dakota's ammonites were very unusual for the group. [1]: 256 During the Late Cretaceous, the region now occupied by the Black Hills of South Dakota may have attracted long-necked plesiosaurs from hundreds of miles away as a source of gastroliths.
Pages in category "Cretaceous geology of North Dakota" The following 8 pages are in this category, out of 8 total. ... Fox Hills Formation; H. Hell Creek Formation; N.
Acipenser † Adocus Restorative model of the Late Cretaceous mammal Alphadon † Alphadon † Alphadon marshi † Altacreodus † Altacreodus magnus † Amersinia † Amersinia FU082 – informal † Amersinia FU82 – informal † Amesoneuron † Amesoneuron FU037 – informal † Amesoneuron FU37 – informal † Ampelopsis † Ampelopsis acerifolia † Anomia † Anomia gryphorhyncha ...